Re: Encrypted RAID1 for storage with Debian Jessie

[commentsabout@riseup.net]

Hello,

On 2017-04-19 09:11, tv.debian@googlemail.com wrote:
> System on usb flash disks always caused me troubles, I use it only if
> the system can be loaded in ram at boot time and the drive isn't used
> for write operation. A low-end small SSD would be a far better option
> in my opinion.

Thanks for the advice. I managed to find a 40 Go Intel SSD, for under 
30€ :)

On 2017-04-19 15:06, Joshua Schaeffer wrote:
> I can't speak to your system being on USB, but in general you can just
> do something like the following:
>
>     $mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda
> /dev/sdb
>     $mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdc
> /dev/sdd
>     $mdadm --create /dev/md2 --level=1 --raid-devices=2 /dev/sde
> /dev/sdf
>
> If you want to use LVM then you create the PV, VG, and LV:
>
>     $pvcreate /dev/md0
>     $pvcreate /dev/md1
>     $pvcreate /dev/md2
>     $vgcreate vg_data1 /dev/md0
>     $vgcreate vg_data2 /dev/md1
>     $vgcreate vg_data3 /dev/md2
>     $lvcreate vg_data1 -n lv_data1 -L <size>
>     $lvcreate vg_data2 -n lv_data2 -L <size>
>
>     $lvcreate vg_data3 -n lv_data3 -L <size>
>
> Then create your LUKS partition:
>
>     $cryptsetup -v --verify-passphrase luksFormat /dev/mapper/lv_data1
> vg_data1-lv_data1_crypt
>     $cryptsetup -v --verify-passphrase luksFormat /dev/mapper/lv_data2
> vg_data2-lv_data2_crypt
>
>     $cryptsetup -v --verify-passphrase luksFormat /dev/mapper/lv_data3
> vg_data3-lv_data3_crypt
>
> Then create your filesystem and mount them:
>
>     $mkfs.ext4 /dev/mapper/vg_data1-lv_data1_crypt
>     $mkfs.ext4 /dev/mapper/vg_data2-lv_data2_crypt
>
>     $mkfs.ext4 /dev/mapper/vg_data3-lv_data3_crypt
>
>     $mount -t ext4 /dev/mapper/vg_data1-lv_data1_crypt /mnt/data1
>     $mount -t ext4 /dev/mapper/vg_data2-lv_data2_crypt /mnt/data2
>
>     $mount -t ext4 /dev/mapper/vg_data3-lv_data3_crypt /mnt/data3

Thank you for the detailed explanations.

I'm a complete noob when it comes to this kind of operations, so, sorry 
for the dumb question : following tv.debian@'s advises, I purchased a 
cheap SSD and installed my system on it (the SSD, and one pair of HDD 
are plugged in). From there on, how should I proceed ?

Thanks in advanced for your help.

CA